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Night Reports 2021

In the tables below, Observing, Weather and Technical refer to time spent observing, time lost to bad weather, and time lost because of technical problems. Note that Observing includes time spent on calibration observations and, occasionally, scheduled on-sky test observations; Technical does not include scheduled downtime (e.g. for planned engineering work).

The Night Duty Officer estimates whether the night was photometric or non-photometric (spectroscopic) based on satellite imagery and SkyCam data obtained through the night. This is a qualitative assessment only and may not always be entirely accurate. IT IS POSSIBLE THAT, ON OCCASION, OBSERVATIONS REQUIRING PHOTOMETRIC CONDITIONS ARE ACQUIRED IN NON-PHOTOMETRIC CONDITIONS. Users should check the quality of their data carefully. Good, average and poor seeing refers to inferred zenith seeing of < 1.0 arcsec, 1.0-2.0 arcsec, and > 2.0 arcsec, respectively. Calima refers to a warm wind that occasionally blows over from the Sahara and brings a lot of fine dust forcing a shutdown to protect the optics.

SKYCAM MOVIES AND ATMOSPHERIC TRANSMISSION

Below we also provide links to Movies constructed from a sequence of optical images obtained with either SkyCam-A (covering the whole sky), SkyCam-T (now showing a 9 degree field centred on each target; was 21 deg pre-21 Oct) or SkyCam-Z (1 degree field). Images are obtained every minute or so throughout the entire night. These movies can usually be used to establish, qualitatively at least, how clear or cloudy a given night was. On bright nights (i.e. when the moon is up), the smaller-field camera's T and Z are often more useful than the full-sky camera A. Additional movies and still images are available from the Skycam Archive. Plots of SkyCamZ Zero Point data are also provided. Zero points here are defined with respect to APASS 10 < r < 13 with no colour term. These indicate to first order periods of thin or thick cloud. A clear night usually results in a flat distribution of ZP values, while thick cloud causes a dip in the ZP level. 'A', 'T' and 'Z' in the SkyCam columns refer to the camera from which the data were acquired.

September 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
25 Sep0.09.30.0Closed due to volcanic ash risk. T A T -
24 Sep0.09.30.0Closed due to volcanic ash risk. T A T -
23 Sep0.09.30.0Closed due to volcanic ash risk. T A T -
22 Sep3.55.70.0Photometric, average seeing. Closed due to cloud first half of night. T A T -
21 Sep9.20.00.0Photometric, average seeing. T A T -
20 Sep9.20.00.0Photometric, average seeing. T A T -
19 Sep0.09.20.0No observing due to risk of damage by ash from nearby volcano. - - - -
18 Sep9.10.00.0Photometric, average seeing. T A T -
17 Sep4.32.82.0Photometric, average seeing. High humidity and rain from clouds on site at beginning and end of night. Secondary mirror focus and cassegrain axis faults. T A T -
16 Sep0.09.10.0High humidity all night. - - - -
15 Sep2.95.90.2Photometric, average seeing. Secondary mirror stall in evening. High humidity most of night. T A T -
14 Sep7.90.01.1Photometric, average seeing. Secondary mirror stall at start of night, altitude node signal issue and autorecovery in early morning. T A T -
13 Sep0.09.00.0Mountaintop power cut in evening & no observing rule under external generator power. High humidity at times. - - - -
12 Sep7.50.01.4Non-photometric. Average/poor seeing. Focus stall at startup. T A T -
11 Sep8.90.00.0Non-photometric. Average seeing. MOPTOP unavailable. T A T -
10 Sep8.90.00.0Non-photometric. Good/average seeing. T A T -
9 Sep8.80.00.0Non-photometric. Good seeing. MOPTOP unavailable. T A T -
8 Sep6.00.01.8Non-photometric. Good seeing. RCS rebooted T A T -
7 Sep1.30.07.5Non-photometric. Good seeing. Hydraulics fault. IO:O shutter fail. T A T -
6 Sep8.70.00.0Non-photometric. Average seeing. T A T -
5 Sep8.70.00.0Non-photometric. Average to poor seeing. T A T -
4 Sep5.73.00.0Non-photometric. Poor seeing. Cloud. T A T -
3 Sep2.70.05.9Non-photometric. Average seeing. Mirror cover sensor fault. T A T -
2 Sep8.00.60.0Photometric. Good seeing. T A T -
1 Sep8.60.00.0Photometric. Good seeing, but degrading through night T A T -

August 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Aug2.56.00.0Photometric. Good seeing. T A T -
30 Aug7.90.00.6Photometric. Good seeing. Focus mechanism fault. T A T -
29 Aug8.50.00.0Photometric with average/good seeing. T A T -
28 Aug8.40.00.0Photometric with average/good seeing. T A T -
27 Aug8.40.00.0Photometric with good seeing. T A T -
26 Aug7.90.00.5Photometric with good seeing. Cas node reboot. T A T -
25 Aug8.30.00.0Photometric with average seeing. T A T -
24 Aug8.30.00.0Photometric with good seeing. T A T -
23 Aug8.30.00.0Photometric with good seeing. T A T -
22 Aug0.00.08.2Altitude node failure T A T -
21 Aug8.20.00.0Non-photometric, good/average seeing. T A T -
20 Aug8.20.00.0Photometric, good/average seeing. T A T -
19 Aug8.20.00.0Non-photometric, good seeing. T A T -
18 Aug8.10.00.0Non-photometric, good/average seeing. T A T -
17 Aug8.10.00.0Non-photometric, average seeing. T A T -
16 Aug0.00.08.1AMN failed to boot, TCC failed, no observing. - - - -
15 Aug3.84.10.2Non-photometric. Average seeing. High dust. IO:O filter wheel init. errors T A T -
14 Aug7.00.01.0Non-photometric. Average seeing. RCS restarted itself. T A T -
13 Aug80.00.0Non-photometric, average seeing. T A T -
12 Aug7.20.00.5Photometric, average seeing. AMN node reboot. T A T -
11 Aug7.90.00.0Photometric, average seeing. T A T -
10 Aug7.90.00.0Photometric, good seeing. T A T -
9 Aug7.80.00.0Photometric, good seeing. T A T -
8 Aug7.80.00.0Photometric, good seeing. T A T -
7 Aug7.30.50.0Photometric, good seeing. T A T -
6 Aug0.00.07.7RCS config error. No observing. T A T -
5 Aug7.40.00.3Photometric, good seeing. Rise restart issue T A T -
4 Aug7.60.00.0Photometric, poor seeing. T A T -
3 Aug7.60.00.0Photometric, good seeing. T A T -
2 Aug7.60.00.0Photometric, average seeing. T A T -
1 Aug7.60.00.0Photometric, average seeing. T A T -

July 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Jul7.00.00.6Non-photometric, good seeing. IO:O filter fault at start T A T -
30 Jul7.00.00.5Non-photometric, good seeing. IO:O filter fault at start T A T -
29 Jul7.50.00.0Non-photometric, good seeing. T A T -
28 Jul7.40.00.0Non-photometric, average seeing. T A T -
27 Jul7.40.00.0Non-photometric, average seeing. T A T -
26 Jul7.40.00.0Photometric, average seeing. T A T -
25 Jul7.40.00.0Non-photometric, average seeing. T A T -
24 Jul0.37.10.0Non-photometric, good seeing. Stopped observing in evening due to calima. T A T -
23 Jul7.30.00.0Non-photometric, average seeing. T A T -
22 Jul6.80.00.5Photometric, average-poor seeing. Auxiliary mechanism node fault at middle of night. T A T -
21 Jul7.30.00.0Photometric, good seeing. T A T -
20 Jul7.30.00.0Photometric, good seeing. T A T -
19 Jul7.20.00.0Non-photometric, good seeing. T A T -
18 Jul7.20.00.0Non-photometric, good seeing. T A T -
17 Jul7.20.00.0Photometric. Good seeing. T A T -
16 Jul7.20.00.0Photometric. Good seeing. T A T -
15 Jul7.10.00.0Photometric. Average seeing. T A T -
14 Jul7.10.00.0Non-photometric (dust). Average seeing. T A T -
13 Jul3.63.50.0Non-photometric. Good seeing. Cloud and dust at start of night cleared later. T A T -
12 Jul3.80.03.3Non-photometric. Cloud and dust. Average seeing. Hydraulic chiller overheated. T A T -
11 Jul0.07.10.0No operations, high calima and thick high cloud. - - - -
10 Jul7.10.00.0Set photometric, but broken cloud rolled in after 1am UT. Good/average seeing. T A T -
9 Jul70.00.0Photometric with average seeing. T A T -
8 Jul70.00.0Photometric with average seeing. T A T -
7 Jul70.00.0Photometric with good/average seeing. T A T -
6 Jul70.00.0Photometric with good seeing. T A T -
5 Jul70.00.0Photometric with good/average seeing. T A T -
4 Jul70.00.0Photometric with good seeing. T A T -
3 Jul70.00.0Photometric with good seeing. IO:O filter wheel problem during evening flats. T A T -
2 Jul70.00.0Photometric with average seeing. T A T -
1 Jul6.90.00.0Photometric with average seeing. T A T -

June 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
30 Jun6.90.00.0Photometric with average seeing. T A T -
29 Jun6.90.00.0Photometric with average seeing. T A T -
28 Jun6.90.00.0Photometric with average/good seeing. T A T -
27 Jun6.40.00.5Average-good seeing. Photometric conditions. Alt axis fail. T A T -
26 Jun6.90.00.0Average-good seeing. Photometric conditions. T A T -
25 Jun6.90.00.0Bad average seeing at very start of night, good seeing thereafter. Photometric conditions./td> T A T -
24 Jun6.40.00.5Photometric in good seeing conditions. MOPTOP twilights, some trigger failures T A T -
23 Jun6.70.00.2Photometric in good seeing conditions. Repeat of secondary mirror focus problem at oper on. T A T -
22 Jun5.30.01.6Photometric with good seeing. Error in secondary mirror focus during oper on. T A T -
21 Jun6.90.00.0Photometric with good seeing. T A T -
20 Jun6.80.00.0Photometric, average/good seeing T A T -
19 Jun6.80.00.0Non-photometric, average seeing. T A T -
18 Jun2.84.00.0Non-photometric, average seeing. High humidity. T A T -
17 Jun5.01.90.0Non-photometric, good/average seeing. T A T -
16 Jun6.90.00.0Photometric, average/good seeing. T A T -
15 Jun6.90.00.0Photometric, good seeing. T A T -
14 Jun5.21.70.0Non-photometric, good seeing. T A T -
13 Jun6.90.00.0Photometric, good seeing. T A T -
12 Jun6.90.00.0Non-photometric, good seeing T A T -
11 Jun6.90.00.0Non-photometric, good seeing. T A T -
10 Jun1.35.60.0Non-photometric, average to good seeing. Closed due to Calima risk during 2nd half og night. T A T -
9 Jun1.15.80.0Non-photometric, average seeing. Closed due to Calima and Cloud. T A T -
8 Jun42.90.0Non-photometric, poor seeing. T A T -
7 Jun0.07.00.0Closed due to cloud. T A T -
6 Jun2.14.90.0Non-photometric, good seeing. Cloud second half of night. T A T -
5 Jun7.00.00.0Non-photometric, good seeing. T A T -
4 Jun7.00.00.0Non-photometric, average seeing. T A T -
3 Jun0.07.00.0High humidity. T A T -
2 Jun4.42.60.0Non-photometric, average seeing. High humidity at start and middle of night. T A T -
1 Jun7.00.00.0Non-photometric, good seeing. T A T -

May 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 May7.10.00.0Non-photometric, good seeing. T A T -
30 May1.70.05.4Photometric. Average seeing. Az motor sensor fault. T A T -
29 May3.50.03.6Non-photometric. Good seeing. Az motor sensor fault. T A T -
28 May7.10.00.0Non-photometric. Good seeing. T A T -
27 May6.01.10.0Non-photometric. Good seeing. T A T -
26 May5.31.90.0Non-photometric. Good seeing. T A T -
25 May7.20.00.0Non-photometric. Average seeing. T A T -
24 May7.30.00.0Non-photometric. Average seeing. T A T -
23 May7.30.00.0Non-photometric with average seeing. T A T -
22 May7.30.00.0Photometric with average seeing. Moptop failed. T A T -
21 May0.07.30.0High levels of Calima. - - - -
20 May7.30.00.0Non-photometric (calima) with average seeing. Moptop failed. T A T -
19 May7.30.00.0Photometric with average/poor seeing. T A T -
18 May7.40.00.0Photometric with average seeing. T A T -
17 May7.40.00.0Non-photometric with average seeing. T A T -
16 May7.40.00.0Non-photometric (calima) with average seeing. T A T -
15 May7.40.00.0Photometric with average seeing. T A T -
14 May7.00.50.0Average to poor seeing in photometric conditions, with a humidity spike around 2.30am. T A T -
13 May7.30.00.2Photometric with average to poor seeing. Secondary mirror focus issue during evening twilight. T A T -
12 May7.50.00.0Photometric with average seeing. T A T -
11 May7.50.00.0Photometric with average/good seeing T A T -
10 May7.60.00.0Photometric with good seeing T A T -
9 May7.30.30.0Good seeing in photometric conditions. T A T -
8 May5.01.61.0High humidity at end of night, Good seeing, photometric. T A T -
7 May6.70.01.0Good - average seeing. T A T -
6 May7.70.00.0Photometric with good seeing. T A T -
5 May7.80.00.0Photometric with good to average seeing. T A T -
4 May7.80.00.0Photometric in good seeing conditions. T A T -
3 May3.04.90.0Non-photometric, high humidity. Average seeing. T A T -
2 May2.95.00.0Non-photometric. Seeing average. High humidity. IO:O offline T A T -
1 May2.95.00.0Photometric becoming non-photometric. Seeing average. IO:O shutter stuck open T A T -

April 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
30 Apr0.25.72.0High humidity. Problems starting Alt axis. T A T -
29 Apr0.08.00.0High humidity. No observing. T A T -
28 Apr0.08.00.0High humidity. No observing. T A T -
27 Apr6.02.00.0Average seeing, non-photometric. IO:O offline T A T -
26 Apr7.70.00.3Good seeing, photometric. IO:O offline T A T -
25 Apr5.82.00.3Average seeing, non photmetric. IO:O offline T A T -
24 Apr0.08.10.0Closed due to high humidity. T A T -
23 Apr5.91.21.0Average seeing, non-photometric. IOO offline, Node 36LV issue on startup. T A T -
22 Apr8.10.00.0Photomteric, average seeing. IO:O offline T A T -
21 Apr8.10.00.0Photometric, good seeing. T A T -
20 Apr8.20.00.0Non-photometric, good seeing. T A T -
19 Apr8.20.00.0Non-photometric, good seeing. T A T -
18 Apr4.70.03.5Non-photometric, average seeing. IO:O offline, L2 alert causing closure. T A T -
17 Apr8.30.00.0Photometric, average seeing. IO:O offline. T A T -
16 Apr7.01.40.0Photometric, average seeing. Closed for humidity. Faulty IO:O shutter so taken offline. T A T -
15 Apr4.44.00.0Non-photometric, average seeing. Closed for humidity. T A T -
14 Apr6.52.00.0Non-photometric, average seeing. Closed for humidity. Error with telescope webserver virtual machine. T A T -
13 Apr0.08.50.0Closed for high humidity. - - - -
12 Apr5.63.00.0Non-photometric, average seeing. Lots of cloud, closed for high humidity. T A T -
11 Apr0.08.60.0High humidity, no observing. - - - -
10 Apr0.08.60.0High humidity, no observing. - - - -
9 Apr6.12.50.0Cloud at start of night, non-photometric, good/average seeing. T A T -
8 Apr0.08.60.0High humidity, no observing. - - - -
7 Apr2.76.00.0Non-photometric. High humidity and rain at start of night and again early morning through to sunrise. Good-average seeing. T A T -
6 Apr0.08.70.0High humidity and some cloud, no observing. - - - -
5 Apr0.08.80.0High humidity and some cloud, no observing. - - - -
4 Apr8.80.00.0Photometric. Good seeing. T A T -
3 Apr3.74.70.4Non-photometric. Good seeing. AMN reboot to auto-fix SFP fault. T A T -
2 Apr8.80.00.0Photometric. Good seeing T A T -
1 Apr7.90.90.0Average seeing. Nonphotometric after midnight. T A T -

March 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Mar6.42.50.0Average seeing. Photometric. T A T -
30 Mar6.52.40.0Photometric, very poor seeing and humidity later in night. T A T -
29 Mar9.00.00.0Photometric, average seeing. T A T -
28 Mar0.09.00.0Bad weather, high humidity and low temperatures. - - - -
27 Mar0.09.10.0High humidity, low temperatures and some high calima. - - - -
26 Mar0.09.10.0Bad weather (high humidity, low temperatures and calima at the start of night). - - - -
25 Mar0.09.10.0High levels of Calima. - - - -
24 Mar0.09.20.0High levels of Calima. - - - -
23 Mar9.20.00.0Photometric with good/average seeing. T A T -
22 Mar9.20.00.0Photometric with average seeing. T A T -
21 Mar9.20.00.0Photometric with good seeing. IO:O offline. T A T -
20 Mar9.30.00.0Photometric with good seeing. IO:O offline. T A T -
19 Mar9.050.00.25Photometric with good seeing. IO:O shutter failure - instrument offline. T A T -
18 Mar8.80.00.5Photometric with good seeing. Node reboot. T A T -
17 Mar9.40.00.0Photometric with good seeing. T A T -
16 Mar9.40.00.0Photometric with good seeing. T A T -
15 Mar9.40.00.0Photometric with average/good seeing. T A T -
14 Mar8.01.40.0Non-photometric. Seeing good. T A T -
13 Mar8.70.70.0Non-photometric. Seeing average. T A T -
12 Mar6.62.90.0Non-photometric. Seeing average. High cloud. T A T -
11 Mar7.52.00.0Non-photometric. Seeing going from poor to good. T A T -
10 Mar9.50.00.0Non-photometric. Seeing varying average/poor T A T -
9 Mar5.20.04.4Photometric. Seeing average. Phase2 database fault in morning. T A T -
8 Mar1.08.60.0Photometric. Seeing average. Closed due to high due to high humidity. T A T -
7 Mar0.09.60.0Closed all night due to high humidity. T A T -
6 Mar0.09.70.0Closed all night due to high humidity. T A T -
5 Mar0.09.70.0Closed all night due to high humidity. T A T -
4 Mar0.09.70.0Closed all night due to high humidity. T A T -
3 Mar9.80.00.0Non-photometric, average to good seeing. T A T -
2 Mar9.80.00.0Non-photometric, average seeing. Engineering tests on Moptop during evening twighlight. T A T -
1 Mar0.09.80.0Closed due to ice risk on Rams T A T -

February 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
28 Feb0.09.80.0Closed due to ice risk. T A T -
27 Feb0.09.80.0Sub zero temperature and high humidity. T A T -
26 Feb5.64.30.0Good / average seeing in photometric conditions. T A T -
25 Feb9.50.10.3Poor to average seeing in spectrometric conditions. T A T -
24 Feb0.09.90.0Closed for night due to high humidity on site. T A T -
23 Feb100.00.0Good to average seeing in photometric conditions. T A T -
22 Feb100.00.0Average seeing in mixed conditions. T A T -
21 Feb0.010.00.0Closed for high humidity. - - - -
20 Feb0.010.00.0Closed for high humidity. - - - -
19 Feb100.00.0Non-photometric, average/poor seeing. Observations taken in manual at start of night to test new instrument. T A T -
18 Feb4.65.50.0Non-photometric, average/good seeing. Closed for cloud. T A T -
17 Feb10.10.00.0Photometric, average/poor seeing. Azm node reboot at start of night. T A T -
16 Feb9.60.00.5Non-photometric, average seeing. Node reboot due to science fold failure. Possible presence of calima during the night. T A T -
15 Feb10.10.00.0Photometric, average seeing. T A T -
14 Feb10.10.00.0Non-photometric; average-poor seeing. T A T -
13 Feb10.20.00.0Non-photometric; average seeing. T A T -
12 Feb10.20.00.0Non-photometric; good-average seeing. T A T -
11 Feb10.20.00.0Non-photometric; good-average seeing. T A T -
10 Feb0.010.20.0No observing; ice on external enclosure mechanisms. - - - -
9 Feb0.010.30.0No observing; ice on external enclosure mechanisms. - - - -
8 Feb0.010.30.0No observing; ice on external enclosure mechanisms. - - - -
7 Feb0.010.30.0No observing; closed due to ice risk. - - - -
6 Feb0.010.30.0Snow - - - -
5 Feb0.010.40.0Snow - - - -
4 Feb0.010.40.0Snow - - - -
3 Feb1.49.00.0Photometric, good seeing. Closed by humidity. T A T -
2 Feb10.40.00.0Photometric. Good seeing. T A T -
1 Feb9.70.70.0Non-photometric. Average seeing. Brief cloud closure. T A T -

January 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Jan10.50.00.0Photometric, average seeing. T A T -
30 Jan10.10.00.4Photometric, average seeing. AMN failure. T A T -
29 Jan10.50.00.0Photometric, good/average seeing. T A T -
28 Jan10.60.00.0Photometric, good/average seeing. Moptop configuration errors. T A T -
27 Jan10.60.00.0Photometric. IO:O offline. T A T -
26 Jan10.60.00.0Photometric. IO:O offline, Raptor engineering work first part of the night. T A T -
25 Jan10.60.00.0Non-photometric, average seeing. T A T -
24 Jan0.010.60.0No observing; ice risk. - - - -
23 Jan0.010.60.0No observing; ice risk. - - - -
22 Jan0.010.60.0No observing; ice risk. - - - -
21 Jan0.010.60.0No observing; ice risk. - - - -
20 Jan0.010.70.0No observing; ice risk. - - - -
19 Jan0.010.70.0No observing; ice risk. - - - -
18 Jan0.010.70.0No observing; ice risk. - - - -
17 Jan0.010.70.0No observing; Ice risk. - - - -
16 Jan0.010.70.0No observing; Ice risk. - - - -
15 Jan0.010.70.0No observing; Ice risk. - - - -
14 Jan0.010.70.0No observing; Ice risk. - - - -
13 Jan0.010.70.0No observing; Ice risk. - - - -
12 Jan0.010.70.0No observing; closed due to ice risk and high humidity. - - - -
11 Jan0.010.70.0No observing; closed due to ice risk and high humidity. - - - -
10 Jan0.010.80.0No observing; closed due to ice risk and high humidity. - - - -
9 Jan0.010.80.0No observing; closed due to ice risk and high humidity. - - - -
8 Jan0.010.80.0No observing; closed due to high humidity. - - - -
7 Jan0.010.80.0No observing; closed for high humidity and wind. - - - -
6 Jan0.010.80.0No observing; closed for high humidity. - - - -
5 Jan0.010.80.0No observing; closed for high humidity. - - - -
4 Jan0.010.80.0No observing; closed for high humidity. - - - -
3 Jan0.010.80.0No observing. Cloud, high humidity - - - -
2 Jan0.010.80.0No observing. Cloud. - - - -
1 Jan10.90.00.0Non-photometric. Seeing average. T A T -